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An Essay on the principles and construction of military bridges, and the passage of rivers in military operations / by Howard Douglas
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( 239 )

TABLE.

No.

Diameters.

Length.

Weight ofcask.

Weightof waterdisplaced.

Weightborne wheni mmersed.

Bung.

Head.

in.

in.

in.

lbs.

lbs ,

lbs.

1

15

14

17

26

102

76

2

16

14

16 5

30

109

79

3

17

15

18

32

132

100

4

20

18

22

47

180

133

5

23*3

19*5

24-75

58

326

268

6

24

22

27-5

83

411

328

7

28* 1

23-4

33-5

101

642

541

8

29-2

25

31

102

657

555

9

28

24

35

115

683

568

10

29-5

25-4

35-5

128

771

643

11

31

27-5

38-5

140

941

806

12

34

31

35

122

1060

938

13

30-9

24 7

51

155

1162

1007

14

33-8

24*6

53-25

159

1336

1177

15

35

28

47

159

1354

1195

The table only contains the dimensions, &c.of casks common in this country; but the fol-lowing rules will readily supply any deficiencyin the extent of the table.

The usual method is to reduce the cask to acylinder of equal content, by taking, from thefollowing table, the number corresponding to